Grinding machine



Jam 31, 1939. H. J. MANKOFF GRINDING MACHiNE 3 Sheets-Sheet 1 Filed Dec.29, 1957 IN VENTOR -H1my tf. M/wmFF ATTORNEY.

Jan. 31, 1939- H. J. MANKOFF GRINDING MACHINE Filed Dec. 29, 193'? 3Sheets-Sheet 2 INVENTOR. Ham) v. M/wra FF B ATTORNEY.

H. J. MANKOFF 2,145,728

GRINDING MACHINE Filed Dec. 29, 1937 3 Sheets-Sheet 3 Jan. 31, 1939.

INVENT OR. fizrweyy zwroFF /"Q M ATTORNEY.

r r v a a a a I f4 Awflaflrralrlan g Patented Jan. 31, 1939 UNITEDSTATES.

PATENT OFF [C V GRINDING MACHINE Henry J. Mankoi'l, Wichita, Kans.Application December 29, 1937, Serial No. 182,296

3 Claims.

My invention relates to a grinding machine and has for its principalobject a rotor grinder of a hammer mill type, having fan blade elementsassociated with the grinding mechanism, the said rotor grinderhereinafter referred to as rotor.

A further object of my invention is to provide.

a grinding machine that is convertible into a blower to discharge theground substance into a place of storage.

A still further object of my invention is to provide a grinding machinehaving a series of devide an air intake at the axis of the rotor, the

said intake to be on one or both sides of the housing, and means tocontrol the volume of air passing therethrough.

A still further object of my invention is to provide a grinding machineadaptable to grinding fodder. straw, or the like as a feed substance,and also to grind grain'or other substance 01' a mineral or likecharacter.

- A still further object of my invention is to provide an adjustablemeans for the feed chute so that chopped ensilage may be fed through themachine'in such a way as to-avoid contact with the grinding elements ofthe rotor, in which case the fan feature is the means to conduct suchmaterial through a duct to place of storage.

These and other objects will hereinafter be .more fully expla ned,reference being had to the accompanying drawings forming a part of thisspecification, and in which like characters will apply to like parts inthe different views of the structure.

Referring to the drawings: Fig. Lisa side view,.of the grinding machineillustratingthe control means for air inlet, and

" fadju'stablesupport" for the feed chute.

Fig. 2is a sectional ,view ofthagrinding machine taken on line 2-2 inFig. 3.

Fig. 3 is a sectional view taken on line 3-3 'in Fig. 1.

Fig. 4 is an enlarged end view of one of the hammer grinding elements.

Fig. 5 is a side view of the element, parts removed for convenience ofillustration. I

Fig. 6 is a side view of the hammer grinding element, modified withrespect to its grinding tip.

Fig. 7 illustrates another modified form of the hammer tip.

The following description of my invention is partially restricted toFigs. 1 and 2, consisting of a housing I substantially arcuate in form,supported by .'a base 2, the housing having a grinding rotorconcentrically trunnioned therein, said rotor carried by a shaft 3, thatis trun- 5 ,nioned in suitable bearings on each side of said housing, asshown at 4.

Positioned on said shaft is a tubular element 5, through which saidshaft extends, and being centrally supported therein by heads 6, thepurpose of which is to avoid the flexing of the shaft when a pluralityof fan blades 1, are welded to the said tubular element, and the saidblades radially extend from the said tube, and equally spacedtherearound, as shown in Figs. 1 and 2. Posi- 5 tioned on the outer edgeof each blade is an adjustable portion 8, as an extension outward foreach blade, said portion being secured by bolts 9, engaging throughelongated slots I 0, respectively, sa d slots transversely positioned inthe said extensions; being so arranged is means to increase or decreasethe velocity of the blast as the rotor turns, and on each blade oppositethe said extension is secured a plurality of hammer grinding elementsspaced therealong and welded thereto, said elements consisting 'of asleeve H, in Y which is removably positioned a grinding element I2. Saidelements are reversibly arranged to prolong the cutting capacity of theouter tip, as each end thereof is similar in form except the tip shownin Fig. 6, and the said grinding elements l2, and secured by theequivalent of a cotter pin l3, said pin engaging through an aperture inthe. sleeve and an aperture positioned in the grinding element withvrespect to the same longitudinally. By this arrangement, when thegrinding elements become worn or otherwise deteriorated, they are easilywithdrawn and reversed, and when both ends become-so d sabled,

it is possible to sharpen each end alike for further engagement.

- Positioned in the annular housing is an arcuate screen N, that issecured in position by engaging ,ensilage or other comminuted material.

pocket is formed between the triangular elements, and in which substancebeing ground is thrown to avoid its equal rotation with the rotor, andfurthermore, to direct the material toward the center of the rotor,where it contacts the said grinding points, and each baifle that isadjacent the said inlet functions as means to retard or restrict the fanblast against outward flow through the feed inlet until each succeedingblade has well passed the feeding point, directing the pressure thatwill exhaust through the screen and outward through a conductor ll,forcing the ground substance to place of storage, and the said conductorhas a cut-off plate i8, pivotally connected at its upper edge as at I 9,and the said plate in its open position is access means for groundsubstance passing through screen ll outward through said conductor H.The free end of said plate is supported by a rod or chain 20, to an openposition, as desired. The feed opening above referred to is equippedwith a channeled chute 2|, the outer end of which is supported by bracemembers 22, connected to the chute and to the housing as at A, at whichpoint the said brace is adjustable to vary the slant of the chute andinward position. The inner end of said chute terminates in closeproximity to where it enters the housing, while the bottom continues asat C and D, last said portions having an oifset E, and means to connectthe same, the ofiset functioning as a pocket in which substance beingground will recede from the grinder a short distance and, as movedonward, will be in contact with the grinding elements of the rotor.

When said chute is moved inward and downward, the same is supported byrods 23, engaging in apertures 24, selectively, a, plurality of whichare spaced downward and through each side of the housing.

When said chute is so positioned and the screen removed, groundsubstance may be fed in the housing and forced onward through theconductor by the fan faculty of the rotor without contact therewith. Inthis capacity, the grinding rotor will function as a blast fan, and thesubstance being conveyed may be similar to that of It will be understoodthat the air supply for the fan feature is at the ends of the rotor,through the medium of an opening 24, concentric to the rotor shaft, saidopening being on each side of the housing and each thereof has aslidingiy arranged member 25, that is diametrically divided so that eachhalf will slide to and from the shaft, and fit closely therearound. Thesaid members slidably engage in tracks 26, at the upper and lowerextremity of said sliding members, the said members removable by a lip21, secured to each, as moving means therefor to a desired position as acontrol for air inlet to the rotor.

In Fig. 2 isshown a segmental portion 28, of the arcuate housing wall,said portion adapted to rock to and from the feeding chute to govern thevertical width of the opening for the substance entering and moving incontact with the rotor.

It will be understood that shaft 3 has a pulley Bl, secured on the outerend thereof to be engaged by a belt transmitting torque from a motor asturning means for the rotor and belt not shown in the drawings. It willalso be understood that the hammer grinding elements are spaced alongthe edge of each fan blade and being staggered with respect to theblades in their conplurality of fan blades spaced around the shaft,

radially extending and secured thereto, and an extension for each bladeand means to adjustably carry the extension at the outer edge of itsrespective blade, a plurality of sleeves secured to each of said bladesand being spaced therealong, a cylindrical grinding element positionedin each sleeve so that one end thereof will extend out- -ward and thesaid grinding elements being reversible, and means to secure the same intheir respective sleeve when selectively reversed.

2. In a rotor for grinding machines, a shaft, a tubular element throughwhich the shaft extends axially and secured together in such a way as tospace the wall of the tubular element from.the shaft, a plurality of fanblades spaced around the shaft, radially extending and secured to thetubular element, and an extension for each blade and means to adjustablycarry'the extension at the outer edge of its respective blade, aplurality of sleeves secured to 'each of said blades and being spacedtherealong, a cylindrical grinding element positioned in each sleeve sothat one end thereof will extend outward and the said grinding elementsbeing reversible, and means to secure the same in their respectivesleeve when selectively reversed.

3. In a rotor for grinding machines, a shaft, a tubular element throughwhich the shaft extends axially and secured together in such a way as tospace the wall of the tubular element from the shaft, a plurality of fanblades spaced around the shaft, radially extending and secured thereto,an extension for each blade, the extension adjustably secured tocorresponding sides of the blades and a plurality of sleeves spacedalong each blade and being secured to the other sides of the blades, agrinding element insertible in each sleeve, said grinding elementssecured in their respective 'sleeves and being reversible with respectto their end engagement, and means to secure said grinding'elements whenselectively reversed.

HENRY J. MANKOFF.

